﻿
#if !defined(MISC_H_INCLUDED)
#define MISC_H_INCLUDED


////
//// Includes
////

#include <cassert>
#include <chrono>
#include <ostream>
#include <string>
#include <vector>

#include "chess.h"
#include "types.h"



////
//// Macros
////

//#define Min(x, y) (((x) < (y))? (x) : (y))
//#define Max(x, y) (((x) < (y))? (y) : (x))





const std::string engine_info(bool to_uci = false);
void prefetch(void* addr);
void start_logger(bool b);

void dbg_hit_on(bool b);
void dbg_hit_on_c(bool c, bool b);
void dbg_mean_of(int v);
void dbg_print();

typedef std::chrono::milliseconds::rep TimePoint; // A value in milliseconds

inline TimePoint now() {
	return std::chrono::duration_cast<std::chrono::milliseconds>
		(std::chrono::steady_clock::now().time_since_epoch()).count();
}

//template<class Entry, int Size>
//struct HashTable {
//	Entry* operator[](Key key) { return &table[(uint32_t)key & (Size - 1)]; }
//
//private:
//	std::vector<Entry> table = std::vector<Entry>(Size);
//};


enum SyncCout { IO_LOCK, IO_UNLOCK };
std::ostream& operator<<(std::ostream&, SyncCout);

#define sync_cout std::cout << IO_LOCK
#define sync_endl std::endl << IO_UNLOCK


/// xorshift64star Pseudo-Random Number Generator
/// This class is based on original code written and dedicated
/// to the public domain by Sebastiano Vigna (2014).
/// It has the following characteristics:
///
///  -  Outputs 64-bit numbers
///  -  Passes Dieharder and SmallCrush test batteries
///  -  Does not require warm-up, no zeroland to escape
///  -  Internal state is a single 64-bit integer
///  -  Period is 2^64 - 1
///  -  Speed: 1.60 ns/call (Core i7 @3.40GHz)
///
/// For further analysis see
///   <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>

class PRNG {

	uint64_t s;

	uint64_t rand64() {

		s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
		return s * 2685821657736338717LL;
	}

public:
	PRNG(uint64_t seed) : s(seed) { assert(seed); }

	template<typename T> T rand() { return T(rand64()); }

	/// Special generator used to fast init magic numbers.
	/// Output values only have 1/8th of their bits set on average.
	template<typename T> T sparse_rand()
	{
		return T(rand64() & rand64() & rand64());
	}
};

/// Under Windows it is not possible for a process to run on more than one
/// logical processor group. This usually means to be limited to use max 64
/// cores. To overcome this, some special platform specific API should be
/// called to set group affinity for each thread. Original code from Texel by
/// Peter Österlund.

namespace WinProcGroup {
	void bindThisThread(size_t idx);
}

#endif // !defined(MISC_H_INCLUDED)